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Ettringite Is a rare mineral with formula Ca6Al2(SO4)3(OH)12 - 26H2O , a Hydrated Calcium Aluminium Sulphate Hydroxide. The hardness is very low: 2-2.5 as well the specific gravity :1.7, much below the average . It forms as a precipitate from hydrothermal solutions and is difficult to distinguish from Sturmanite. It is found on N’Chawning II Mine,Northern Cape, South Africa. Always included with small growing planes. The color is a bright lemon yellow. A gem for collectors! This is my best piece, for this material is of very high quality!. Size:14.9x12.1x6.9 mm. Weight: 4.88 ct. CODE# 2476